Jerome travis



(No Model.)

J. TRAVIS. BLAGKBQARD BRASIER. No. 365,356. Patented June 21, 1887.

w/ L M5555. I D l- UNITED STATESr PATENT @Ii Fries.

JEROME TRAVIS, OF CLINTON, MICHIGAN, ASSIGNOR OF ONE-HALF TO BRADLY G.SWIFT, OF SAME PLACE.

BLACKBOARD ERASER.

SPECIFICATION forming part of Letters Patent No. 365,226, dated June 21,1887.

Application filed April 80, 1887.

To all whom it may concern.-

Be it known that l, JEROME TRAVIS, a citizen of the United States,residing at Clinton, in the county of Lenawee and State of Michigan,have invented certain new and useful Improvements in Blackboard-Erasers;and-I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same,refer ence being hadto the accompanying drawings, which form part of this specification.

My invention relates to that class of devices commonly known asblackboard-erasers, and has for its object to provide an eraser with astrip of erasing material that canl be so adjusted and turned when anyparticular portion of it becomes worn out as to bring 'a fresh supplyinto use, and thereby enable the eraser to be used until all the erasingmaterial is eX hausted, when a new strip can be substitutedand thedevice made to operate as well as when new 5 and it consists in theconstruction hereinafter described, and more particularly pointed out inthe claims.

Heretoforein the construction of blackboard-erasers it has been commonto permanently secure the erasing material to a block by` means of glueor other adhesive material, or to s'o secure the material on the blockby other means in such a way that it cannot be changed from its Originalposition. In all of these constructions it is a well-known fact that the'erasing material wears off at the ends'and sides of the erasers first,while in many instances that in the middle or body of the eraser remainsgood and could be used for a vmuch longer time. Should the eraser beused after it is thus worn, its hard ends scratch through the paint orenamel of the board without effecting the purpose for which itwasintended, and in a short time the board becomes so damaged orwornfrom improper use as to render a new iinish upon it necessary, or itssubstitution by a new board imperative. It has been found impracticabletore-cover these worn erasers, from the fact that, in order to make themdurable until the erasing material is worn out, even at the ends, thematerial has to be so rigidly secured to the block that the block isinjured, or in many cases destroyed,

Serial No. 236,696.' (No model.)

` in the effort to remove the old material for the substitution of thenew.

Referring to the drawings, Figurelisa perspective view of my inventionready for use. Fig. 2 is a cross-sectional view on the linex x of Fig.1.' Fig. 3 is a perspective view with the erasing-strip and clamp-bandremoved. Fig. 4 is a perspective view showing the erasing-strip on theblock with the clamp band removed, and Fig. 5 is a view of theclampingband removed.

Like letters of referencel refer to corresponding parts in each figureof the drawings.

A represents a block of wood or other suitable material, which may beround, oval, oblong, or of any other desirable shape adapted for theuse. The block is cut out at its base a to form a central portion, B,which is `extended at some distance below the base to serve as aholderfor the erasing material. The base of the block is iiared outward andupward at I) to form a handheld for grasping it With when in use. f Y

On the under side of the central portion, B, there is one or more sheetsof felt or other suitable erasing-pads, C, secured by means of glue orother adhesive material. These pads are made somewhat smaller indiameter than the surface of the extended portion B, and are well lledwith medium-sized holes or'perforations c, to enable a deposit ofchalk-dust around and within them during any cont-innous use upon theblackboard without removing the eraser therefrom.

Around the extended portion B there is placed a thick broad adjustablestrip, D, comterial, that extends from the flange a of the base to belowthe end of the extended portion, terminating on the same plane withthelower surface of the pad C, leaving a space, d, for a dust-chamberAbetween the strip D and the edge of the pad below the part B.

On the outer side and around the soft eras ingstrip D there is aclamping-band, E, of sheet metal, of less width than theerasingprojecting at right angles therewith 'an ear, F, of about thesame width as the band, which ears extend outward from one side or endof the block on a parallel line with each other,

posed of felt or other soft suitable erasing ma-v band. rlhis band hasformed at each end and VOO and have screw-holes through them for theinsertion of aserew, f, therein, for adjusting the band in holding thestrip.

The lower edge of the band E has notches c in its sides about midway itslength, and that portion of the edge of the band between the notches isturned inward to form a flange or hold against the side of theerasingstrip to prevent the strip and band from slipping on each otherafter the band is adj usted thereon.

In operation, when the end or side portions of the erasing-strip D havebecome Worn so that the wear is upon the ends or sides of the pad G, theserewf is turned partially out and the band loosened sufficiently toenable the strip to be drawn down to provide additional wcaring'surfaeeat thc ends. When worn at the ends, after being drawn down once or more,the screw is taken out, the adjustingband E is removed, and the wornportions of the erasing-strip are turned around tothe sides of theholder and a portion of the sides brought toA the ends, where, afterbeing worn in like manner as in the first instance, it may in turn bemoved around, bringing a fresh unworn portion ofthe strip upon the endsor part receiving the greatest wear, until the strip is entirelyconsumed, except so much of it as is necessary to form a hold under theadjustingband. Then the block is made round on its under side, insteadof oval or oblong, the erasingstrip wears alike on all sides, and theband E only requires to be loosened and thestrp drawn down from time totime, as it becomes worn, until the erasing material is exhausted,

when its place can be supplied with a new Strip.

Should the pad C become worn and thin after long and continuous use, itbeing only on the center of the block, it may be scaled off withoutserious injury to the block and a new pad substituted therefor. llhus itwill be seen that by my construction a blackboarderaser is formed thatmay be used continuously for almost any length of time by occasionallysupplying a new adjustable erasing-strip.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent of the United States, is-

1. The combination, with a blaekboarderaser having a reduced extendedportion provided with an erasing-pad on its under side, of au adjustableerasingstrip around the extended portion, as and for the purpose setforth.

2. rIhc combination, with ablackboard-eraser having an extended portionprovided with a perforated erasing -pad smaller' in diameter 4than theend thereof, of an erasingstrip adj ustabl y secured around the extendedportion, with its lower edge on substantially the same plane with theundersurface of the padfas and for the purpose set forth.

3. The combination, with a block for a blackboard-eraser having areduced extended portion provided with an adjustable erasingstrip aroundit extending below the under side thereof, ofv an adjusting clamp-bandaround said strip over the reduced portion of the block, as and for thepurpose set forth.

4. The combination, with a blackboard erasing-block having an adjustableerasing-strip around it, of a clamping-band provided withholding-flanges on its edge and ears at its ends for an adjusting-screw,as and for thepurposc set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JEROME TRAVIS.

Vitiiesses:

C. D. KEYES, D. KEYES.

